John blake tare



es uw i taint www JOHN BLAKE TARR, OF FAIRHAVENpMASSACHUSET'IS.

Letters Patent No. 83,223, dated October 20, 1868.

IMPROVEIVIENT IN CAST-STEEL TIRES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it maf/y concern Be it known that l, J OHN BLAKE TARE, of Fair Haven, in the county of Bristol, and State of Massachusetts, have invented an Improved Machine for Making Cast-Steel Tires, and compressing the metal while in the moulds 5 and' I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specica'tion, in which- Figure l is an elevation of one side of the machine, showing the several parts in position for pouring the steel into its mould.

Figure 2 is a similar view of the same parts, showing the follower or pressing-head in the act of pressing upon the metal in the mould.

Figure 3 is asimilar View of the same parts, showing the three rings elevated from the bed .of the machine for relieving the casting. i

Figure 4 is a vertical central section of the machine vin the act of compressing a tire.

Figure 5 is a section, taken in the horizontal plane indicated by line x, fig. 3, showing a top view of the bed-plate.

Similar letters of reference indicate corresponding parts in the several figures.

The obj ect of my invention is to produce compressed and condensed-steel tires for railroad-car wheels, and to effect this object by means of a mould, which is constructed of several sections, so operated that the steel can be condensed while in the mould, which gives to it the form of a tire, after which the tire can be quickly relieved, and allowed to cool and shrink unil formly, as wiil be hereinafter described. n

Steel tires, as heretofore constructed, are produced from ingots, by hammering, rolling, and welding, processes which involve a great deal of l. -bor and expense, besides which, the steel is more'4 or less injured, and its Strength greatly impaired, by the treatment necessary to give it the required shape.

To-enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings, A represents the bed-plate of the mould, which is constructed with annular depressions in its upper surface, for receiving two rings or mould-sections, F G, as will be hereinafter described.

Near the outer edge or circumference of the bedplate A, three pillars, C C C, are erected, perpendicularly to its horizontal surface; and on top of these pillars a head-plate, B, is secured, iu a horizontal position, and held down in such manner as to resist the upward pressure to which it is subjected during the act of compressing and condensing the steel in the mould.

On top ofthe head-plate B, and firmly bolted thereon, is a strong cylinder, D,.the vertical axis of which coincides with the vertical axis of the mould. In this cylinder Works a piston, I', to which three vertical rods, I I I, are attached, as shown in the drawings. These rods are arranged at equal distances apart,'around the centre of. the piston, and they pass down through stuifing-boxes applied to the plate B, which latter forms the bottom head of cylinder D.

To the lower ends of the three piston-rods I, a crosshead, J, is rigidly secured, and to this head a followerring, H, is attached, in a plane parallel to the horizontal surface of the bed-plate A, as shown in figs. 1, 2, and 4. This follower-ring is designed to serve as the top section of the mould, and also as the pressing-head, for pressing upon and condensing the steel in the mould, as shown in fig. 4.

I prefer to employ hydrostatic pressure for operating the follower-ring, although I may use screw-pressure, or employ any well-known mechanical power for this purpose.

The cylinder D communicates, in a suitable manner, with a hydrostatic pump or engine, which. may be constructed in the usual manner common toliydrosatic presses.

The annular depression b, in the upper surface of the bed-plate A, is adapted for receiving a ring, G, which forms the interior wall of the mould, and also a ring, F, which forms the external wall of the mould.

Ihat portion of the surface of the depression b which is between the two annular walls, F G, is made so as to produce the internal vertical face of the tire, and a part of the flange thereof, as shown in iig. 4, while the external annular surface or periphery of the tire, and the other part of the said flange, is produced by the inner surface of the outer ring or wall, F.

The thickness of the follower-ling H is slightly less than the width of the space between the two rings, F G, so that, during the act of forcing this ring upon the melted steel in the mould, the air or gas may readily escape around ring H.-

To makea e with this machine, I proceed as follows:

The two rings, F and G, are'adju'sted in their places upon the bed A, and firmly held down by meansof the hooks a and e, which are turned over the upper ends of these rings. The follower H being elevated out of the way, as shown in fig'. 1, and the mould-sections suitably smoked, to prevent the steel from adhering to their surfaces, the melted steel is poured into the space between the two rings. The follower-ring H is then brought ,down upon the surface of the melted steel, and this steel compressed and condensed before it sets or becomes cool.

XVhen the metal has been condensed sufficiently, and before it is allowed to cool too much, the followerring is raised, carrying with it the two rings, F and G, and leaving the casting, P, free to contract uniformly upon the bed-plate A.

In order that the two rings, F and G, shall be raised with the folower-ring H, the hooks g and y', on said rings, are turned over the ring H, when this ring is brought down to the position shown in fig. 4.

It is important to have the mould made-of movable sections, as described, in order that three of these sections can be removed from the tire, P, and this tire allowed tocool uniformly; otherwise the metal might crack in cooling.-

The inner section, G, should certainly be removed as soon as practicable, to prevent the tire from shrinking upon it.

Should it vbe found desirable, the mould may be lined with some suitable refractory substance, to protect it om injury by the intense heat of the melted steel.

What I claim as new, and desire to secure by Letters Patent, is

l. The machine for making a compressed-steel car- Wheel tire, substantially as described.

2. As a'new and improved article of manufacture, a compressed-steel tire for a car-Wheel, made separate from, and adapted for being shrunk upon, the central portion of such Wheel, substantially as described.

Witness my hand, in matter of for making same. JOHN BLAKE TARR.

Witnesses:

R. T. CAMPBELL, EDW. SCHAFER.

` my application fora patentifor compressed cast-steel tire, and for machine 

